Expansion-bolt.



A. P. BRUSH.

EXPANSION BOLT.

APPLICATION men oc.s. 1913.

w Patented July 18, 1916.

*vgfi Inventor 27 Aimorr r, BRUSH, or GREENWICH, oolvivno'rrcnr.

EXPANSION-BOLT.

To all whom it mag concern Be it known t at I, ABBOTT P. BsUsH, acitizen of the United States, and a resident of the town of Greenwich,county ofFair- 6 is similar to Fig. 4, but in partially ex-Ipandedposition.- Fig. 7 is a section on the field, and State ofConnecticut, have invented a certain new and useful Improvement inExpansion-Bolts, of which the following is a specification.

This invention relates to a' device commonly known a an ex ansion boltwhich is adapted to be inserte within a recess in a foundation and beexpanded into contact with the walls of such recess.

The objects I have in view are to produce a bolt of this character whichcan be very cheaply manufactured, which can be easily inserted in placewithin a recess substantially of the same diameter of the bolt and whichwill make a very firm anch rage within the recess. These and furtherobects will more fully appear fromthe following specification andaccompanying drawings, considered together or separately;

In the drawings:, Figure 1 is a view. of

so that that has to occur. Fig. 8 shows the.

the body portion of one form of bolt embodying my invention when placedwithin' a recess in a foundation. Fig. 2 is an end view thereof seenfrom the end of the body which is introduced within the work. Fig.'

3 is a view of the pin. The pin, in combination with the body,constitutes the com-' plete bolt. Fig. 4 is a view in section on alarger scale of the same.kind of bolt illust'rated in the precedingfigures, showing'it in unexpanded position. Fig. 5 is a sectional viewon the line 5-5 thereof. Fig.

line'7-7 of Fig.6. Fig. 8 is a. view similar to Figs. 4 and 6, but withthe bolt entirely expanded. Fig. 9 is a view of a modification of thebolt in expanded condition; and Fig. 10 is a similar view of anothermodif fication.

In allof the views, likev parts are designated by the same referencecharacters.

As before stated, my improved bolt comprises a body and a. pin. The body1' is cylindrical in shape. It is provided with an opening 2 extendingfrom one end' inward. ,The length of this opening and the size thereofdepend upon the size of-the bolt. A plurality of slots 3 extend from theother end of the bolt inward. As shown in the views, I employ four ofthese slots, each extending from the periphery. of the bolt toSpecification of Letters Patent.

Patented July 18, 1916.

Application filed December 6, 1913. Serial No. 804,967.

the center and from one end of the bolt to 4 is of the same diameterthroughout. It is of'sucha size that it can enter the opening 2. It isof a length sufficient to extend through the embedded extremity of thebody. This pin is adapted to be driven'into the opening 2, and thenbeyond the opening so that its end reaches to the embedded end of thebolt. What happens when the pin is driven in, is graphically illustratedin Figs. 4, 6 and 8.

Fig. 4 shows the pin introduced to a point not quite at the base of theopening 2. Fig. 6 shows it driven in part way into the space at the baseof the slots 3. The effect of this is to distort the slotted portion ofthe body outward into close engagement with the walls of the recess 5,in which the bolt lies. The inner edges of the portion of the body, atthe intersection of the slots, are also distorted outward, as shown inFig. 7, provided the recess 5 is sufiiciently small pin driven all theway in. The effect of this 15 to expand-the slotted portions of the bodyradially outward. This produces a circumferential contact, because theportions of the material of the body between the, slots can i gationsmay be shallow, as in Figs. 1 to 8, or

may be deep.

. I prefer to have the opening 2 extend to a point beyond the inner endsof the slots 3, as shownin Figs. 1 and 4. This produces an overlap inthe slotted portion of the opening. The effect of this is to cause aradial expansion of the slotted portion by the end of the pin close tothe baseof the opening 2. I also preferlto provide a *pointed' end onthepin, as shown, which will assist in the" expanding operation. I alsoprefer tomake the'base of the opening and 4, so that the .res'i'stanceto the entrance 2 with inclined walls, as shown in Figs. 1 ,7

Fig. '9 illustrates a Stub bolt. In this embodiment of the invention,the body projects from the foundation, and is provided withscrew-threads 9.

Fig. 10 illustrates a socket bolt. In this embodiment of the invention,the body is entirely embedded in the foundation. It is provided with aninternally threaded por-. tion 10'. When expanding this form of bolt,the pin is first driven in until its head projects but a slight distancefrom the face of the foundation. Then the seated by means of a punch.

In accordance with the provisions of the patent statutes, I-havedescribed the principle of my invention, together with the apparatuswhich I now consider to represent the best embodiment thereof; but Idesire to have it understood that the apparatus shown is merelyillustrative and that the invention maybe carried out in other ways.

Having "now described my invention,

' what I claim as new and desireto secure by Letters Patent, is 4 1. Anexpansion bolt having a body formed of a single piece of distortablematerial, said body having a shank and an eneter smaller than theopening but greater.

' than the width of the slot so that when point where it encounters theslot and perpin is entirely manently expand the material of that poitionof the shank which is slotted.

' 2. An expansion bolt having a body formed of a single piece ofdistortable material, said body having a shank and an enlarged headadapted to hold the work, said shank-being of substantially'the samediameter throughout and having a centrally located longitudinal openingextending from the head end of the body toward the point "thereof, saidshank having two slots located at an angle to one another and madeacross .the shank and intersecting at substantially the longitudinalaxis of the same, said slots extending from the point of the shanktoward the head, said slotsmeeting said opening, each being of lesswidth than the diam- .eter of the opening, in combination with a pin ofa diameter smaller than the opening but greater'than the width of aslot, so that when driven into the slots it will distort the materialadjacent to the slots to grip the pin at the points where it encountersthe slots and permanently expand the material of that portion of theshank which is slotted.

3. An expansion bolt having a body formed of a single piece ofdistortable material, said body having a shank and an enlarged headadapted to hold the work, said shank being of substantially the samediameter throughout a centrally located longitudinalopening'extendingfrom the head end of the body toward the pointthereof,'the shank having a slot ,extendin from the point thereof towardthe hea said slot meeting said opening and extending into the same, andbeing of less width than the diampin of a diameter smaller than theopening but greater than the width of the slot so that when drivenintothe slot it will distort the material adjacent tothe slot to grip thepin for the length of the-slot and permanently expand the material ofthat portion of the shank which is slotted.

This specification signed and witnessed this 28th day of N ovember,1913.

' ABBOTT P. BRUSH.

Witnesses:

JAS. F. COLEMAN,- ANNA E.- BENTON.

